<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div {
			position: relative;
			width: 200px;
			height: 100px;
			background-color: pink;
			margin: 100px auto;
		}
		p {
			position: absolute;
			top: -40px;
			left: 50%;
			margin-left: -20px;
			width: 0;
			height: 0;
			border-style: solid;
			border-width: 20px;
			border-color: transparent transparent pink transparent;
			font-size: 0;
			line-height: 0;
		}
	</style>
</head>
<body>
	<div>
		<p></p>
	</div>
</body>
</html>